Apparatus for the manufacture of artificial filaments



J. DELPECH Filed Dec. 7, 1525 Dec; 18, 1928.

APPARATUS FOR THE uANbFAc'ruRE OF ARTIFICIAL FILAMENTS Patented Dec. 18, 1928.

JACQUES DELPECH, OF RENNES, FRANCE.

APPARATUS FOR THE'MANUFACTURE OF ARTIFICIAL FILAMENTS.

Application filed December Artificial silk fibers which are obtained from solutions of cellulose, such as cellulose acetate or nitrocellulose, are produced in the form of filaments which have very irregular cross sections. The present invention has for an object the provision of a process and apparatus for spinning which forms the filaments obtained in a uniform flat shape with the general appearance of thin microscopic ribbons.

This process may be carried out by various difierent forms of apparatus, certain of which are illustrated in the accompanying drawings in which Figure 1 is a vertical cross section of a metier casing of the usual type, having one formof the invention embodied therein.

Figure 2 is a cross. section through the spinneret and tube supplying the spinning solution, showing a modification.

Figure 3 is a diagrammatic illustration of a further modification.

Figure 4 is a side view partly in section of a still further modification applied to a spinneret which produces a single filament.

Figure 5 1s a similar view of a spinneret, which produces a number of filaments.

Figure 6 shows in cross section the usual filaments produced.

Figure 7 shows in similar cross section filaments produced by the-process of this invention. I I

There is shown the usual main casing A in which are tubes 1 through whichthe spinning solution is supplied and connected to these tubes are the spinnerets 2. In the usual practice these spinnerets are located so that I the longitudinal axis thereof lies in the same line as the direction taken by the thread issuing from said spinneret. This thread 3 passes about suitable guides 4 and is wound on rollers 5. Where the thread is drawn in a direction which constitutes an extension of the axis of the spinneret, it is apt to be inregular in cross section and may assume forms such as illustrated in Figure 6. a 3

The spinnerets 2 in the form of the invention illustrated in Figure 1, are placed at an angle to the direction of travel of the thread so that the line of travel of the thread from the spinneret to the. guides is very nearly at right'angles with the axis of the spinneret: The exact angle may be varied without departing from the invention, but it should be 7, 1925. Serial No. 73,907.

preferably quite a large angle. In this way the thread is flattened and becomes substan tially uniform in cross section as is indicated in Figure 7.

This change of direction of the which this flattened filament is formed, may be attained in various ways. In Figure 2 there is a modification in which the spinneret 2 which is formed of glass preferably has its extreme end 6 bent at an angle to the axis of the body thereof and the thread 3 is drawn off in a line substantially parallel to the axis of the body of the spinneret, which is of.

course at quite an angle to 'the tip portion 6. In this case the spinneret itself is attached to the supply tubes 1 in the usual form.

In the form of the invention illustrated in Figure 3, the tube 2 is attached to the supply tube 1 at an angle as shown in Figure 1 and is also provided with the benttip 6, as shown in Figure 2. A change of direction may be easily made somewhat greater in this form of the invention than in the other.

thread by,

In the form shown in Figure 4, the usual I duces a plurality of filaments at one time, all

of which are ledaround a common guide 8 located at one side of the spinneret.

It is obvious that the essence of the invention consists in leading the thread away fromthe tip of the spinneret at a sharp angle to w the axis of the body of the spinneret so as to flatten the resulting filament by drawing it acrossthe edge of the spinning orifice. It I has been found that the original filaments are given a more uniform shape in this manner and that the flat shape imparted thereto permits them to be spun into fabrics with greater advanta e than is the case with the usual irregular aments.

. It is obvious that the process ma be applied to artificial silk which is spun rom any desired solution and that the form of apparatus employed may be varied widely withoutdeparting from the invention as vset forth in the process. The invention is, therefore, to be regarded as limited only by the scope of the appendedclaim.

I claim: A device for spinning filaments from cellulose solutions comprising a spinneret having its delivery v end bent at an angle to the axis of the body thereof and a guide for said filament located in a line substantially parallel to the said axis, so that the filament is caused to change its direction of movement as it issues'from saidorifice. I

' In testimony whereof I aflix my signature.

JACQUES DELPECH. 

